<template>
  <Select
    @dropdown-visible-change="handleFetch"
    v-bind="$attrs"
    @change="handleChange"
    :options="getOptions"
    v-model:value="state"
  >
    <template #[item]="data" v-for="item in Object.keys($slots)">
      <slot :name="item" v-bind="data || {}"></slot>
    </template>
    <template #suffixIcon v-if="loading">
      <LoadingOutlined spin />
    </template>
    <template #notFoundContent v-if="loading">
      <span>
        <LoadingOutlined spin class="mr-1" />
        {{ t("component.form.apiSelectNotFound") }}
      </span>
    </template>
  </Select>
</template>
<script lang="ts" setup>
import { PropType, ref, computed, unref, watch } from "vue";
import { Select } from "ant-design-vue";
import type { SelectValue } from "ant-design-vue/es/select";
import { isFunction } from "@/utils/is";
import { useRuleFormItem } from "@/hooks/component/useFormItem";
import { get, omit, isEqual } from "lodash-es";
import { LoadingOutlined } from "@ant-design/icons-vue";
import { useI18n } from "@/hooks/web/useI18n";
import { propTypes } from "@/utils/propTypes";

type OptionsItem = {
  label?: string;
  value?: string;
  disabled?: boolean;
  [name: string]: any;
};

defineOptions({ name: "ApiSelect", inheritAttrs: false });

const props = defineProps({
  value: { type: [Array, Object, String, Number] as PropType<SelectValue> },
  numberToString: propTypes.bool,
  api: {
    type: Function as PropType<
      (arg?: any) => Promise<OptionsItem[] | Recordable<any>>
    >,
    default: null,
  },
  // api params
  params: propTypes.any.def({}),
  // support xxx.xxx.xx
  resultField: propTypes.string.def(""),
  labelField: propTypes.string.def("label"),
  valueField: propTypes.string.def("value"),
  immediate: propTypes.bool.def(true),
  alwaysLoad: propTypes.bool.def(false),
  options: {
    type: Array<OptionsItem>,
    default: [],
  },
});

const emit = defineEmits(["options-change", "change", "update:value"]);

const optionsRef = ref<OptionsItem[]>([]);

const loading = ref(false);
// 首次是否加载过了
const isFirstLoaded = ref(false);
const emitData = ref<OptionsItem[]>([]);
const { t } = useI18n();

// Embedded in the form, just use the hook binding to perform form verification
const [state] = useRuleFormItem(props, "value", "change", emitData);

const getOptions = computed(() => {
  const { labelField, valueField, numberToString } = props;

  let data = unref(optionsRef).reduce((prev, next: any) => {
    if (next) {
      const value = get(next, valueField);
      prev.push({
        ...omit(next, [labelField, valueField]),
        label: get(next, labelField),
        value: numberToString ? `${value}` : value,
      });
    }
    return prev;
  }, [] as OptionsItem[]);
  return data.length > 0 ? data : props.options;
});

watch(
  () => state.value,
  (v) => {
    emit("update:value", v);
  },
);

watch(
  () => props.params,
  (value, oldValue) => {
    if (isEqual(value, oldValue)) return;
    fetch();
  },
  { deep: true, immediate: props.immediate },
);

async function fetch() {
  const api = props.api;
  if (!api || !isFunction(api) || loading.value) return;
  optionsRef.value = [];
  try {
    loading.value = true;
    const res = await api(props.params);
    isFirstLoaded.value = true;
    if (Array.isArray(res)) {
      optionsRef.value = res;
      emitChange();
      return;
    }
    if (props.resultField) {
      optionsRef.value = get(res, props.resultField) || [];
    }
    emitChange();
  } catch (error) {
    console.warn(error);
    // reset status
    isFirstLoaded.value = false;
  } finally {
    loading.value = false;
  }
}

async function handleFetch(visible: boolean) {
  if (visible) {
    if (props.alwaysLoad) {
      await fetch();
    } else if (!props.immediate && !unref(isFirstLoaded)) {
      await fetch();
    }
  }
}

function emitChange() {
  emit("options-change", unref(getOptions));
}

function handleChange(_, ...args) {
  emitData.value = args;
}
</script>
